/*
 * This file is part of the OWL API.
 *
 * The contents of this file are subject to the LGPL License, Version 3.0.
 *
 * Copyright (C) 2011, The University of Manchester
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see http://www.gnu.org/licenses/.
 *
 *
 * Alternatively, the contents of this file may be used under the terms of the Apache License, Version 2.0
 * in which case, the provisions of the Apache License Version 2.0 are applicable instead of those above.
 *
 * Copyright 2011, University of Manchester
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.coode.owlapi.rdf.model;

import org.semanticweb.owlapi.model.IRI;
import org.semanticweb.owlapi.model.OWLAnonymousIndividual;
import org.semanticweb.owlapi.model.OWLLiteral;
import org.semanticweb.owlapi.model.OWLOntology;
import org.semanticweb.owlapi.model.OWLOntologyManager;

/**
 * Author: Matthew Horridge<br>
 * The University Of Manchester<br>
 * Bio-Health Informatics Group<br>
 * Date: 06-Dec-2006<br>
 * <br>
 */
public class RDFTranslator
		extends
		AbstractTranslator<RDFNode, RDFResourceNode, RDFResourceNode, RDFLiteralNode> {
	private RDFGraph graph;

	/**
	 * @param manager the manager
	 * @param ontology the ontology
	 * @param useStrongTyping true if strong typing is required
	 */
	public RDFTranslator(OWLOntologyManager manager, OWLOntology ontology,
			boolean useStrongTyping) {
		super(manager, ontology, useStrongTyping);
		graph = new RDFGraph();
	}

	/**
	 * @return the graph
	 */
	public RDFGraph getGraph() {
		return graph;
	}

	@Override
	protected void addTriple(RDFResourceNode subject, RDFResourceNode pred,
			RDFNode object) {
		graph.addTriple(new RDFTriple(subject, pred, object));
	}

	@Override
	protected RDFResourceNode getAnonymousNode(Object key) {
		if (key instanceof OWLAnonymousIndividual) {
			RDFResourceNode toReturn = new RDFResourceNode(
					((OWLAnonymousIndividual) key).getID().getID().hashCode());
			//System.out.println("RDFTranslator.getAnonymousNodeTricked() "+key.getClass().getSimpleName()+"\t"+key+"\t"+toReturn);
			return toReturn;
		}
		RDFResourceNode toReturn = new RDFResourceNode(
				System.identityHashCode(key));
		//System.out.println("RDFTranslator.getAnonymousNode() "+key.getClass().getSimpleName()+"\t"+key+"\t"+toReturn);
		return toReturn;
	}

	@Override
	protected RDFLiteralNode getLiteralNode(OWLLiteral literal) {
		return translateLiteralNode(literal);
	}

	/**
	 * @param literal literal to translate
	 * @return translated literal
	 */
	public static RDFLiteralNode translateLiteralNode(OWLLiteral literal) {
		if (!literal.isRDFPlainLiteral()) {
			return new RDFLiteralNode(literal.getLiteral(), literal
					.getDatatype().getIRI());
		} else {
			return new RDFLiteralNode(literal.getLiteral(),
					literal.hasLang() ? literal.getLang() : null);
		}
	}

	@Override
	protected RDFResourceNode getPredicateNode(IRI uri) {
		return new RDFResourceNode(uri);
	}

	@Override
	protected RDFResourceNode getResourceNode(IRI uri) {
		return new RDFResourceNode(uri);
	}

	/**
	 * clear the graph
	 */
	public void reset() {
		graph = new RDFGraph();
	}
}
